check out /help /ignore
you can ignore that specific nick only, regardless of the address:
//ignore $nick
is the same as
//ignore $nick $+ *@*
or you can ignore various address masks regardless of nick:
//ignore $address($nick,3)
If you're going to just ignore the nick, use an invalid switch in case someone is using the nick 'on' or 'off'.
/ignore -q off
isn't the same as
/ignore off
